Realised I needed to add interface tension forces to provoke "bubbling". Sadly a gap appears between fluids at the interface and SPH doesn't seem to be able to avoid this, but thankfully it's not too noticeable here.
Particles - 77292
Smoothing length - 1px
Stiffness - 1500
Timestep - .05
Simulation time - ~35 minutes
That is amazing.
microgamestation 4 months ago